Manufacture of artificial silk from acetyl cellulose



Patented Dec. 25, 1923. 1,478,926

UNITED STATES PATENT OFFICE.

WALTER JAMES STEVENSON, OF LONDON, ENGLAND.

MANUFACTURE OF ARTIFICIAL SILK FROM ACETYL CELLULOSE.

No Drawing. Application .flled larch 18, 1923. Serial No. 624,822.

To all whom it may comm: circular motion. The number of filaments Be it known that I, WALTER James are dependent upon the thickness of the yarn 2o STEVENSON, a sub'ect of the King of Great which it is intended to produce. The fibres Britain and Ireland, and a resident of are then dried and wound on to bobbins.

6 London, England, have invented a certain The-artificial silk thus made is not regenernew and useful Improvement in the Manuated cellulose but cellulose containing acetic feature of Artificial Silk from Acetyl Celluacid. 4 so lose, of which the following is a specifica- I am aware that it has been already protion. posed to make artificial silk by uirting I. For the purposes of this invention I take solutions of cellulose acetate into sa t soluacetyl cellulose made preferably under m tions but I make no broad claim thereto. British Patent N 0. 130,029 of 1919, whichl I claim: dissolve in acetone or other suitable 501- The manufacture of artificial silk from vents from which is removed every trace of acetyl cellulose by dissolving same in acell suspended or insoluble matter, and puttin tone or other suitable solvents, and after this in containers from which it is force filtration forcing same through fine orifices under pressure b compressed air, or pump, or openings, into a decomposing bath con- 40 through fine ori ces The orifices are subtaining sodium sul hate, which forms a conmerged in a decomposing solution of sodium tinuous thread or bre.

I sulphate which removes the solvent, and In testimony whereof I have aflixed my leaves a continuous thread of fibre. This signature hereto this 26th day of February, fibre is passed round a bobbin or deposited 1923. into some form of yarn contalner having a WALTER JAMES STEVENSON. 

